Protruding Saddle Roof Structure of Toraja, Minang and Toba Batak House: Learning from Traditional Structure System

Structure system of Nusantara Architecture has been known for its durability. Traditional structure knowledge was passed from generation through folksong, storytelling or old verse. Toraja, Minang, and Toba Batak have similar house roof shape which is gable roof with protruding at the end like buffalo horn. The similarities in structural system need to be elaborate. This paper attempts to seek the structural system of Toraja, Minangkabau and Toba Batak house, especially the roof structure system. The research conducted to discover the similarities of the roof structure system, study the construction and tectonics, and also learn the load transfer. By learning from local knowledge of building structure system, people can learn to build new buildings using local wisdom, instead of only imitate the form.